The Wise Man's Fear

This book is simply fantastic.

Yet frustrating at the same time. The whole book begs the question “what has happened that Kvothe has lost his power?” Yet this is never touched upon. Obviously there will be a sequel or sequels (hopefully Rothfuss won't try to cram the entirety of the answer into a single tome!) But there is no other book that I can think of that leaves you hanging as sorely or as long.